fix many internal links

Fixed a number of internal links that need to
go to the GitHub site.

Ran `make www` to perform the above.

2020/otterness/README.md

@@ -66,7 +66,7 @@ I found [here](http://www.kunstderfuge.com/beethoven/variae.htm#Symphonies).
 However, as discussed under the [Limitations](#limitations) section below, not
 all of them work correctly.  I will admit to having used
 `http://www.kunstderfuge.com/-/midi.asp?file=beethoven/symphony_6_1_(c)cvikl.mid`
-for most of my testing (see [cvikl.mid](cvikl.mid)).
+for most of my testing (see [cvikl.mid](%%REPO_URL%%/2020/otterness/cvikl.mid)).
 
 
 ### Usage

2020/otterness/index.html

@@ -412,7 +412,7 @@ I found <a href="http://www.kunstderfuge.com/beethoven/variae.htm#Symphonies">he
 However, as discussed under the <a href="#limitations">Limitations</a> section below, not
 all of them work correctly. I will admit to having used
 <code>http://www.kunstderfuge.com/-/midi.asp?file=beethoven/symphony_6_1_(c)cvikl.mid</code>
-for most of my testing (see <a href="cvikl.mid">cvikl.mid</a>).</p>
+for most of my testing (see <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/otterness/cvikl.mid">cvikl.mid</a>).</p>
 <h3 id="usage">Usage</h3>
 <p>Compile the program using the following command (I tested this using both
 <code>clang</code> and <code>gcc</code>):</p>